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DDR speed backward compatibility

V

vitec

Junior Member
I'm planning to upgrade my 2.5 year sold P4 1.7 GHz, Intel 845 GBV, 256 MB RAM motherboard. But I need to do it in phases. The first and foremost I thought upgrading RAM would be a good idea. The current motherboard I have supports only DDR 266.
* My question is will this motherboard support a DDR 400 memory stick. (This new memory will be useful when I upgrade my CPU/mobo to the latest ones).

Also, I have a quation with dual channel mode in the latest mobos. Say for example there are four DIMM slots in the mobo.
* If I fill two macthing slots with DDR 400 and two other with DDR 266 - what will be the eventual memory speed ?
* Is it possible that the first two DIMM slots work at 400 Mhz and the other two 266 MHz or is it wishful thinking ?

thanks in advance
 
All DDR (1) is backwards compatible.

Your second question. All the RAM will run at the speed of the slowest RAM module. But, yes you can mix them.
 
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